Receiver



Oct. 23, 1928. 1,688,674

vH. G. WEBSTER RECEIVER Original Filed June 7, 1923 2 Sheets-Sheet l Harz EZ/Z/TEF Ey M Iz/Ty H. G. WEBSTER RECEIVER Original Filed June '7, 1923 WWI Y n y WI 2 Sheets-Sheet 2 2/ [ufl 25 Patented Oct. 23, 1928.

HARRY G. ,WEBSTEIBZ CHICAGO, ILLINOIS.

RECEIVER.

Application led June 7, 1923, Serial No. 643,890. Renewed lTanuary 11, 1928.

My invention relates to receivers of the type used for the reception oftelephonic currents, an object being to provide an improved arrangement of the above character having Y coil or helix consisting of Winding 13--14,

said Winding being preferably arranged so that an armature may extend therethrough and be affected by the voice currents 5 certain features of construction and operatraversing the coil. 'Ihe winding terminates tion more particularly pointed out in the ensuing part of the specification and appended claims.

In the laccompanying drawings I have shown several4 forms of my invention, in-

Flg. 1 shows la preferredarrangement of receiver mechanism and is a cross' sectionalw view through the device;

Fig. 2 is a top plan view showing the interior of Fig. 1 with the ear piece and diaphragm removed;

Fig. 3 isa cross sectional line 3-3 of. Fig. 2;

Fig. 4 shows a crystal detector circuit adapted `for use in combination'with the review along the ceivers of Figs. 2', 6 or 7 Fig. 5 shows aV tuned circuit of the audion tube type adapted for use in combination with the receivers of Figs.y 1, 6 or 7;

Fig. 6 shows another form, in which the armature of the receiver mechanism is direct- 1y connected to a microphone button;

Fig. 7 is another form of receiver mechaat connectors 23, 24 so that it may be connected to the desired circuit. The armature y15 is referably supported so that it may move in ependent 4of its energizing coil 13-14, so as to reduce the inertia and momentum thereof to a minimum, and I preferably support the armature so that it moves bodily'to actuate th'e diaphragm 12. A connecting stem 16 extendsfrom the'armature 15 tothe diaphragm 12, being clamped to the diaphragm by means of suitable nuts 17. In or- 1 der to assist in supporting the armature 15, and' also maintain the diaphragm 12 under a normal tension, I provide a spring 18 adjustably supported in the bridge piece' 19 so as to be able to vary the tension thereof according to the adjustment required. u l To control the operations of the armature 15 I provide magnets to attract the armature one Way or the other, according to the direction of current in its coil. I employ magnets which are maintained permanently magnetized during they use of the device either as electromagnets orso called permanent magnets.

nism operating as a loud speaker for radio In the device of Figs. 1 to 3 I employ permaand equipment and in which the armature con-A trolling magnets are electrically controlled;

Fig. 8 shows a magnet structure in which the two permanent magnets zare connected together as a single unit of magnetizable material as distinguishing from the form of Figs. 1 to 3 where the separator is of non-magnetic material.

Referring now to the form of receiver `shown in Figs. 1', 2 and 3,.a suitable enclosure A is employed, comprising a casing 10 and ear `piece 11 between which is clamped in a suitablemanner a diaphragm 12.

For operating the diaphragm 12 I preferably employ an electromagnet having a reciprocatory armature so mounted that 1ts olar- .ity is reversed with reversals of lcurrent 1n the electromagnet coil and associated `with magnets, in this-form permanent magnets, preferably of the horseshoe type, positioned on opposite sides of the armature soV that the armature-will be attracted toward one or 4the other, as the direction of voice currents through the electromagnet coil vary.v

The -electromagnet comprises a suitable nent horseshoe magnets 20-21 positioned on opposite sides of the armature and with opposite pole ends of opposed polarity. This is indicated in Fig. 1 wherethe magnets are marked to indicate their polarity, vN indicating a north pole and S a south pole.

With this arrangement, in the operation of the devicefof Figs. 1, 2 and 3, the diaphragm operating armature 15 has its polarity varied as the voice currents traversing the coil vary. Thus with the voice current traveling in one direction, the armature is attracted 'toward lonepermanent magnet, and repelled by the other permanent magnet, and with the current reversedthe armature is attracted toward the other magnet and repelled by the opposite magnet.

Thus as the voieecurrents are impressed upon the operating electromagnet coil, the armature 15 vibrates in accordance with the variations of these voice currents, to operate the diaphragm 12 accordingly.

Thereceiver mechanism of Figs. 1 to 3 is f in combination with the crystal detector circuit of Fig. 4, or it maj7 be used in combinationwith a tuned circuit of the audion tube type as shown in Fig. 5. When used with Fig. 4 the terminals 23-24 of the receiver are connected to, terminals 33-34; and when used with the tuned circuit of Fig. 5 the receiver terminals are connected across the terminals L13--44- InFig. 6 I have shown a modiied form of apparatus in .which the device acts as a voice current repeater by having the receiver armature operate a connected microphone 27. I have shown the vmicrophone 27 connected in circuit with a receiver A, which is indicated as of the type shown in Figs. 1 to 3 but of course may be of any other approved design. Or the microphone may be connected in circuit with a loud speaker A', which may be of the typeof apparatus shown in Figs. 1 to 3 with an amplifying horn.

The arrangement of Fig. 6 is particularly useful in connection .with radio equipment such as a crystal set where the' current received is not amplified but transmitted directly to the helix 'of the receiver and then amplified through the use of the connected microphone. It is to be understood, however, that I also ycontemplate using the arrangementof Fig.' 6 with a tuned circuit of the audion tube type shown by way of illustrationin Fig. 5 where the termipals 23-24 of the receiver mechanism are c'nnected to terminals43-44 of Fig. 5.

In Fig. 7 I have shown another modied form of my invention, in which the armature controlling magnets are electrically magnetized. To this end the magnets comprise suitable cores 20 and 21 with windings thereon so arranged and so connected with a source of current 25 that they are polarized with opposed pole-faces of opposite polarity.

In the drawing this is indicated by the letters N and S, as in Fig. 1. The strength of these magnets 20 and 21 may be varied in a suitable way, as for instance by adjusting thearesistance 30. The armature 15 in this receiver is shown as connected to a diaphragm 12 and amplifying horn 28 of a loud speaking construction.

-The receiver mechanism'of Fig. 7 may be employed in combination with the crystal receiving set of the character illustrated in Fig. 4 for example, or it may be connected with a tuned circuit of the audion 'tube type shown in Fig. 5 by way of illustration. When used in either combination it may be adjusted soas to secure the most effective and desirableiresults.

Although in Fig. 6 I have shown permanent magnets 20L-21 and in Fig. 7 electromagnet-s 2()`21, it will be apparent that either type of magnet may be used in the receiver of each ligure.

In Fig. 8 I have shown a unit construction,

'trated in Figs. 1 and 3. The Fig. 8 construction, nevertheless, provides two independent magnetic circuits with which the armature 15 is correlated; and in this respect is like the construction illustrated in- Figs. 1, 2 and 3.

Although I have shown preferred forms of my invention, I contemplate using it in other ways than that illustrated, and therefore do not desire to be limited to these precise forms but aim to cover all that which comes within the spirit and scope of the appended claims.

lVhat I claim as new and desire to secure by United States Letters Patent is:

1. In a receiver of the character described, an electromagnet having a reciprocatory armature the polarity of which is reversed with reversals of current in the electromagnet coil, and two magnets positioned each on a si'de of the armature opposite the other, whereby the armature is attracted toward one or the other of the magnets according to the polarity of the armature, and sound producmg means actuated by said armature.

2. In a receiver of the character described,

an electromagnet having a reciprooatory armature the polarity of which is reversed -with reversals of current in the electromagnet coil, and two magnets positioned each on a side of the armature opposite the other, whereby'the armature is attracted bodily toward one or the other of the'magnets according to the polarity of the armature, and sound producing means actuated by said armature.

3. In a receiver of the character described, an electromagnet comprising a helix and core movably supported in the helix and whereby the electro-magnetic field including the core may be reversed with reversals of current in the helix, and a pair 6I magnets each positioned with a pole-face operatively associated with each end of the core, t-he magnets having opposing polar-ities at each end of the core, whereby the core is moved in one direction or another according to the direction of current in the helix, and sound producing;r means actuated by said armature.

4. Ina receiver of the character described,

an electromagnet comprisng a helix and core supported to reciprocate bodily transversely of the axis of the helix and whereby the electro-magnetic field including the core may be reversed with reversals of current in the helix, and a pair of magnets each positioned with a pole-face operatively associated with each end of the core, the magnets having opposing polarities at each end of the core, whereby the core is moved in one direction or another according to the direction of current in the helix.

5. In a receiver of the character described,

two magnets oppositely disposed with opposite pole-faces 0f opposed polarity, an electromagnet having a movable core the polarity of which is reversed with reversal of current in the electromagnet coil and positionedbetween the opposed pole-faces of the magnets so as to be attracted by one or the other of the magnets according to 'the polarity of the armature and thereby provide an increasing,l

magnetic path for the magnet attracted to.

6. In a receiver of the character described, two permanent horse-shoe magnets oppositely `disposed with opposite pole-faces of opposed polarity, an electromagnet having a movable core the polarity of which is reversed with reversal of current` in the electromagnet coil, and positioned between the opposed pole-faces of the magnets so as to be attracted by one or the other of the magnets according to the polarity of the armature, and repelled from the pole-faces of the other magnet.

7. In a receiver of the character described, two permanent horse-shoe magnets oppositely disposed with opposite pole-facesof opposed polarity, an electromagnet having a movable core the polarity of which is reversed with'reversal of current in the electromagnet coil, and positioned between the opposed polefaces of the magnetsso as to be lattracted byv -one or the other of the magnets accordino to the polarity of the armature, and repezlle'd from the pole-faces ofthe other' magnet, and

-provide an increasing magnetic path for the magnet toward which it is attracted and a decreasing magnetic path for the magnet from which it is repelled.

8. Ina receiver of the character described,

kan electromagnet having a reciprocatory armature extending through the helix thereof so that the magnetic flux will vary in the armature with variations of voice currents impressed upon the helix and two magnets oppositely disposed relative to the armature and to each other whereby the armature is attracted toward one or the other of the magnets as the magnetic flux in the armature varies, and sound producing means actuated by said armature. f

9. In a receiver ofthe character described, an electromagnet having av reciprocatory armature extending through the helix thereof so that the magnetic flux will vary in the armature with variations of voice currents impressed upon the helix, and two magnets -oppositely disposed relative to the armature each positioned with a pole-face operatively associated with each end ofthe armature, the magnets having opposing polarities at each end of the armature, whereby the armature is attracted toward one or theother of the magnets as the magnetic flux in the armature varies. Y

10. In a receiver of the character described, an electromagnet having a reciprocatory armature extending through the helix thereof so that the magnetic flux will vary in the armature with variations of voice currents ture the polarity of which is reversed with reversals of currentl in the electromagnet coil by voice currents impressed thereon, and two magnets positionedeach on a side of the armature opposite the other, whereby the v armature is attracted toward one or the other of they magnets according to the polarity of the armature; andy a repeating amplifier including a microphone having an electrode mechanically connected with and operated by the receiver armature for repeating the voice current operations of the ,receiver armature.

12. In a receiver of the character described, an electromagnet y having a reciprocatory armature the polarity of which is reversed )withreversals of current inthe electromagnet coil, and two magnets positioned each'on a side of the armature opposite the other, whereby the armature is attracted toward one and repelled by the other of the magnets, and viceversa, accordingv to lthe polarity of the armature, and sound producing means actuated vby said armature.

13. In a receiver of the character described, an electromagnet having areciprocatory armature the polarity of which is reversed with reversals of current in the electromagnet coil, and two magnets positioned each on aside of the armature. opposite the other, whereby the armaturev is attracted bodily -toward one and repelled by the other of the magnets, and vice versa, according to the polarity of the arma ture, and sound producing means actuated f by said armature.

14. In a receiver of the character described, an electromagnet comprisinga heliX and core movably supported in the helix and whereby the electro-magnetic field including the core may be reversed with reversals of current in the helix, and a pair'oi1 magnets composed of opposite magnetic poles arranged in pairs, a helix in the field of force of said poles having its axis parallel to said pairs, an armature within said helix acting to vary inversely the reluctance of the magnetic circuits of said pairs responsive to variations of voi/ce currents impressed upon the helix.

16; In a device of the character described, magnetic operating mechanism therefor including two independent magnetic' circuits composed of opposite magnetically connected poles arranged in pairs, a helix in the field of force of said poles having its axis parallel to s'aid pairs, an armaturewithin said helix acting to vary the reluctance of the magnetic circuitsl of said pairs responsive to variations of voice currents impressed upon the helix.-

17. In a device of the character described, magnetic operating mechanism therefor including tw'o independent magnetic circuits composed of opposite magnetically Vconnected poles arranged in pairs, a helix in the field of force of said poles having its axis parallel to` said pairs, an armature within said helix acting to vary inversely the reluctance of the magnetic circuits of said pairs responsive to variations of voice currents impressed upon the helix.

18. In a device of the character described, magnetic operating mechanism therefor including two independent magnet-ic circuits composed of opposite magnetic poles ar ranged in pairs, a helix in the field of force of said poles, an armature in said helix movable in one direction responsive to voice currents of one direction impressed upon the helix to decrease the magnetic reluctance of one of said pairs and increase the magnetic reluctance of the other pair, and oppositely etfectiveupon the pairs responsive to voice current of another direction.

19. In a receiver of the character described, an electromagnet having a reciprocatory armature the polarity of whichy is reversed with reversals of current in the electromagnet coil, two magnets positioned ,each on a side ofthe armature opposite the other, whereby the armature is attracted toward one or the other of. the magnets according to the polarity of the armature, means for adjusting the normal magnetic strength of the two magnets, and sound producing means actuated responsive to said armature.

20. In a receiver of the character described, an electromagnet having a reciprocatory armature extending through the helix thereof so that the magnetic fiux will vary in the armature with variations of voice currents impressed upon the helix and two magnets oppositely disposed relativevto the armature and to each other whereby the armature is attracted toward one or the other of the magnets as the magnetic ux in the armature varies, an electromagnetic circuit forthe two magnets for varying the normal strength thereof, and sound producing means'responsive to said armature.

21. In a receiver of the character described, an electromagnet having a reciprocatory armature extending through the helix thereof so that the magnetic flux will vary in the armature with variations of' voice currents impressed upon the helix, two magnets oppositely disposed'relative to the armature each positioned with a pole-face operatively associated .with each end of the armature, the magnets having opposing polarities at each end of the armature, whereby the armature is attracted toward one or the other of the magnets as'the magnetic flux in the armature varies, and a circuit for varying the strength of the two circuits including windings forv HARRY G. WEBSTER. 

